Homeostasis in the horse is a complex set of interacting metabolic processes so internal conditions remain stable and relatively constant. Homeostasis includes the regulation of temperature and the balance between acidity and alkalinity (pH). It is a process that maintains the stability of the horse's internal environment in response to changes in external conditions
Homeostatic processes act at t...he level of the cell, the tissue, and the organ, as well as for the horse as a whole.
Principal Homeostatic processes include the following:
1) Temperature Regulation
The horse's body tries to maintain a constant body temperature. An advantage of temperature regulation is that it allows the horse to function effectively in a broad range of environmental conditions. That thermal stability comes at a price, since an automatic regulation system requires additional energy. If the temperature rises, the horse loses heat by sweating, via the latent heat of evaporation. If it falls, this is counteracted by increased metabolic action, by shivering, and by thickening the hair coat.
2) Regulation of the pH of the blood at 7.365 (a measure of alkalinity and acidity).
3) Regulation of their blood glucose concentration
4) The kidneys are used to remove excess water and ions from the blood. These are then expelled as urine. The kidneys perform a vital role in homeostatic regulation in horse's, removing excess water, salt, and urea from the blood.
5) If the water content of the blood and lymph fluid falls, it is restored in the first instance by extracting water from the cells. The throat and mouth become dry, so that the symptoms of thirst motivate the horse to drink.
6) If the oxygen content of the blood falls, or the carbon-dioxide concentration increases, blood flow is increased by more vigorous heart action and the speed and depth of breathing increases.
7) Sleep timing depends upon a balance between homeostatic sleep propensity, the need for sleep as a function of the amount of time elapsed since the last adequate sleep episode, and circadian rhythms that determine the ideal timing of a correctly structured and restorative sleep episode.
If you are still reading this, Please know that All PHT Products are designed with these principals in mind. We provide products that will help your horse feel his best by providing a SAFE healing environment.
So when buying a product and using it on your horse, ask yourself is this product really helping my horse?


BOT reflects heat via fibers in fabric back into the body

I am unsure what you mean by traditional  PHT is traditional but it is unipolar 

Here is the difference between bipolar and unipolar
The negative (unipolar) calms neurons and encourages rest, relaxation, and sleep. When sufficiently high in gauss strength, it can even produce general anesthesia. And because it is neuron-calming, it has been successfully used in the control of neurosis, psychosis, seizures, addictive withdrawal, and movement disorders. A negative magnetic field consistently produces a predictable, long-term healing response, because only this field can ultimately relieve stress or injury. The body itself always responds with negative magnetic field energy to counter any stressor. The negative magnetic field counteracts stress by the following mechanisms: normalization of pH (acid-base balance), correction of cellular swelling or edema, and release of molecular oxygen.
In contrast, the positive pole has a stressful effect on the body. With a prolonged exposure, it interferes with metabolic functioning, produces acidity, reduces cellular oxygen, and encourages the spread of latent microorganisms. As a neurologist, Dr. William Philpott has seen that a positive magnetic field excites or stimulates neurons. The higher the gauss strength of the positive pole, the higher the level of stimulation. In fact, a sufficiently high positive magnetic field can even provoke seizures and precipitate psychosis in those so predisposed.
The negative magnetic field heals by alleviating these common disease factors. It alkalinizes tissues and releases oxygen from its bound state back to its molecular state. By returning tissues to a normal healthy state, a negative magnetic field governs energy recovery, relieves inflammation, swelling, and other symptoms, and accelerates healing.
There are two ways to relieve pain with magnet therapy:

A positive magnetic field causes stress, which raises the level of endorphins, the body’s own painkillers, and relieves pain.
A negative magnetic field is anti-stressful, replacing acid-hypoxia which causes pain, with alkaline-hyperoxia, which relieves pain.

However, the only way to treat disease is to relieve acid-hypoxia by alkalinizing and oxygenating the tissue which is done with through Negative Magnetic Field.

To read more on bipolar and unipolar http://www.painxequine.com/unipolar_vs_biopolar.htm